How can corn cultivation be high-yield? In fact, there is a particular emphasis on topdressing. Corn topdressing is not only an indispensable management step in the corn planting process, but also the basis for ensuring a good harvest in the late corn season. However, many people do not know much about the laws and methods of corn topdressing. Many farmers' friends often have some misunderstandings when they are topdressing. For example, direct application of the surface, such as the timing of fertilization, often leads to a lot of fertilizer, but the effect of topdressing is not ideal. Let's talk about the corn topdressing: 1 corn fertilizer rule; 2 corn top dressing time; 3 corn timing, method and dosage; 4 corn top dressing special considerations. First, the law of corn fertilizer Nitrogen and phosphate fertilizers were absorbed during the whole growth period of maize. Among them, the demand for nitrogen and phosphorus was the highest, and the absorption was decreased at the late stage of grain filling. Although the absorption of phosphate fertilizer was less in the later stage, the proportion still accounted for about one-third of the whole growth period; The demand for potash fertilizer is mainly concentrated from the jointing stage to the heading stage, in which the potassium is most needed during the flowering stage, and the potassium fertilizer is basically no longer needed after the flowering period. Second, corn top dressing time The large trumpet period of corn (about 10-12 leaves of corn) is the most vigorous stage of physiological growth and vegetative growth. At this time, the roots and ears of the plants grow together and the amount of fertilizer needed is the most demanding period during the whole growth period. At this time, topdressing can not only provide sufficient nutrients for corn growth and development, but also promote spikelet differentiation, increase ear size, increase grain fullness and single grain weight, and increase yield at the later stage. . Corn topdressing has the best effect of chasing twice fertilizer. The first time in the jointing and booting stage (accounting for two-thirds of the total amount of topdressing), the second application of spiked grain fertilizer (accounting for one-third of the total amount of topdressing) can The first fat was started after about 10 leaves. If time is not allowed, you can also carry out a one-time topdressing in early July, but you must not topdress. Third, the number and method of corn topdressing There are four suitable growth stages for maize topdressing: topdressing in seedling stage, topdressing in jointing stage, topdressing in earing stage (large trumpet period), and topdressing in grain stage; the fertilizer requirements in the above four growth stages are different, fertilization amount and fertilization The methods are also different and should be noted. 1. Topdressing in the seedling stage: The amount of fertilizer required for corn in the seedling stage is not large. It should be lightly topdressed. Generally, it is carried out in the period from the fixed seedling to the jointing stage. In order to reduce the labor input, it can also be used to promote the seedling fertilizer and the jointing fertilizer commonly used by everyone. . In the seedling stage, the topdressing fertilizer is mainly based on quick-acting nitrogen fertilizer, and at the same time, appropriate amount of phosphorus, potassium fertilizer and decomposed farmyard manure can be appropriately applied according to the growth situation of the corn. Topdressing can be carried out in the 3-4 leaves of corn. Common corn land can be applied with 500 kg of decomposed farmyard manure + 2-3 kg of urea per mu. For corn, corn should be properly increased to supplement the base fertilizer. Each acre can be applied to 1000 kg of decomposed farmyard manure + 4-5 kg ​​of urea. In the seedling stage, the topdressing of the corn should be based on the growth of the corn. If the growth is weak, the phenomenon of de-fertilization should be topdressed, but if it is strong, it is not necessary to carry out topdressing. 2, jointing stage topdressing: this topdressing is mainly to increase and extend the photosynthesis area of ​​the leaves, while ensuring the promotion of roots, strong stalks, and spikes of corn, topdressing should also be based on quick-acting nitrogen fertilizer, generally in corn 7-9 leaves When applying acupoints, ordinary corn fields can apply 10-15 kg of urea per acre. For the plots with insufficient phosphorus and potassium fertilizer, 7-10 kg of NPK compound fertilizer can be applied per acre, with appropriate amount of decomposing. Farmyard manure is better. 3, ear chasing: chasing the ear fertilizer, generally in the big bell mouth period, mainly to promote the differentiation of spikelet florets, so that the ear spikes and large grains, increase the upper leaves, should be based on quick-acting nitrogen fertilizer, but because of this time corn The amount of fertilizer required is relatively large, and it is possible to apply quick-acting urea per acre or topdressing high-nitrogen and low-phosphorus compound fertilizer, and apply 15-17 kg of land with sufficient base fertilizer and high fertility. The average plot is 18-20 kg, and the base fertilizer is insufficient. Or the land with poor fertilizer can be applied 22-25 kg. In addition, the planting density of the multi-application, the small density can reduce the amount of topdressing. 4, grain season topdressing: grain season topdressing, generally in the corn filling process, because the demand for nitrogen and phosphorus in the maturity to maturity of corn is relatively large, can account for about 40% of the entire growth period, topdressing can prevent corn Early premature aging can also prolong the photosynthesis of leaves, increase the grain weight of the ears, and increase the yield. The grain fertilizer can be carried out when the ear is silking. It can be sprayed with 2% nitrogen and phosphorus mixed solution, and spray 75-100 kg of water and fertilizer solution per acre. Fourth, topdressing method 1. Now there are many farmers and friends who are saving money and paying for fertilizer. Spreading fertilizer will not only cause a large loss of fertilizer efficiency (nitrogen fertilizer is easy to volatilize), but also reduce the absorption of nutrients by corn, and the effect of top dressing is not good. It is recommended that you use artificial gouging to cover the soil. The fertilization distance is generally 10 cm from the root of the plant, and the depth of the crater is 10 cm (the fertilization is too easy to burn, the fertilization is too shallow, and the root absorption rate is too low). 2. In addition, there are also many people who are saving things and directly attacking and fattening. This is also an unscientific and unacceptable method and must be corrected. 3. When topdressing, the planting density is large, and the density can be reduced. In addition, the sandy soil has poor water retention and fertilizer retention, and should be applied in small amounts to prevent fertilizer loss. 4, it is best to look at the weather forecast before topdressing, it is best to topdress the soil before the rain; 5. Some corn plots will be greedy and late-maturing, and such plots should be supplemented with phosphorus and potash to promote maturity as soon as possible. 6. After corn topdressing, it should also be flexible to know whether it needs to be watered according to the dry and wet conditions of the soil. The relevant knowledge about corn topdressing and yield increase is finished. When planting corn, everyone must combine the situation of their own corn fields. Reasonable topdressing is the key to high yield. Hydroponics is a subset of hydroculture, the method of growing plants without soil, using mineral nutrient solutions in a water solvent. 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